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Addition

Level 7 / foundation

2d + 2d (ones carry)

3 visual steps / answer-window addition

1. Fill tens

Step 1: Fill tens
raw windows
running strip
Tens window: 5 + 2 = 7. Hold 7; wait for carry from the next window.

Tens window: 5 + 2 = 7. Hold 7; wait for carry from the next window.

2. Fill ones

Step 2: Fill ones
raw windows
running strip
Ones window: 8 + 6 = 14. Hold raw 14; settle carry later.

Ones window: 8 + 6 = 14. Hold raw 14; settle carry later.

3. Settle carry

Step 3: Settle carry
Settle onceKeep ones; carry moves left.raw windows
settled digits
Settle raw 7 | 14 into 84; keep ones and move carry left.

Settle raw 7 | 14 into 84; keep ones and move carry left.

Practice Level 7

A few quick rounds make digit release automatic; carry is the only thing to keep.

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